in a brazen attack. cell phone safety: to all those minutes add up to health problems for kids? dr. jon lapook reports. and it's a place where wounded warriors learn to hope again. david martin on the closing of walter reed. captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> schieffer: good evening, scott's off tonight. i'm bob schieffer. the fallout from washington's inability to find a solution to the budget crisis and raise the debt limit has, apparently, begun. on wall street, the stock market was down for the third day in a row. the dow fell more than 198 point today. for the week, it's down nearly 400 points, and it has lost close to $105 billion in value. some of the bond rating services are now saying that even if congress does reach an agreement on a budget plan, it may be too late to avoid lowering the rating on some american securities. we have three reports tonight on that and what it means for small business and your credit card. and we start with anthony mason. anthony. >> reporter: bob, america's credit rating has never fallen below triple "a,"